Aggression intensity and frequency increased as provocation levels were experimentally increased. The experiment involved subjects punishing percieved wrongdoers by administering hot/spicy sauce. 

MAOA gene experiment

No prior controlled experimental studies have tested if the MAOA gene directly drives aggressive behavior. 

University of Minnesota

The Monoamine Oxide gene is nicknamed warrior gene which is linked to aggression  that was seen in survey based studies and observations 

MAOA Gene "warrior gene" 

McDermott, R.,  Tingley, D., &  Cowden, J. (2009a, February 17). Monoamine oxidase A gene (MAOA) predicts behavioral aggression following provocation. https://www.pnas.org/ 

Monoamine oxidase A gene (MAOA) predicts behavioral aggression following provocation

MAOA gene and aggression 

Subjects with low activity MAOA (MAOA-L_ exhibited higher levels of aggression when provoked.

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